1c8f7a62cSLen Brown /* 2c8f7a62cSLen Brown * dock.c - ACPI dock station driver 3c8f7a62cSLen Brown * 4c8f7a62cSLen Brown * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> 5c8f7a62cSLen Brown * 6c8f7a62cSLen Brown * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7c8f7a62cSLen Brown * 8c8f7a62cSLen Brown * This program is free software; you can redistribute it and/or modify 9c8f7a62cSLen Brown * it under the terms of the GNU General Public License as published by 10c8f7a62cSLen Brown * the Free Software Foundation; either version 2 of the License, or (at 11c8f7a62cSLen Brown * your option) any later version. 12c8f7a62cSLen Brown * 13c8f7a62cSLen Brown * This program is distributed in the hope that it will be useful, but 14c8f7a62cSLen Brown * WITHOUT ANY WARRANTY; without even the implied warranty of 15c8f7a62cSLen Brown * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16c8f7a62cSLen Brown * General Public License for more details. 17c8f7a62cSLen Brown * 18c8f7a62cSLen Brown * You should have received a copy of the GNU General Public License along 19c8f7a62cSLen Brown * with this program; if not, write to the Free Software Foundation, Inc., 20c8f7a62cSLen Brown * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21c8f7a62cSLen Brown * 22c8f7a62cSLen Brown * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23c8f7a62cSLen Brown */ 24c8f7a62cSLen Brown 25c8f7a62cSLen Brown #include <linux/kernel.h> 26c8f7a62cSLen Brown #include <linux/module.h> 275a0e3ad6STejun Heo #include <linux/slab.h> 28c8f7a62cSLen Brown #include <linux/init.h> 29c8f7a62cSLen Brown #include <linux/types.h> 30c8f7a62cSLen Brown #include <linux/notifier.h> 31671adbecSKristen Carlson Accardi #include <linux/platform_device.h> 32914e2637SAl Viro #include <linux/jiffies.h> 3362a6d7fdSRandy Dunlap #include <linux/stddef.h> 34c8f7a62cSLen Brown #include <acpi/acpi_bus.h> 35c8f7a62cSLen Brown #include <acpi/acpi_drivers.h> 36c8f7a62cSLen Brown 37a192a958SLen Brown #define PREFIX "ACPI: " 38a192a958SLen Brown 397cda93e0SLen Brown #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" 40c8f7a62cSLen Brown 41f52fd66dSLen Brown ACPI_MODULE_NAME("dock"); 42c8f7a62cSLen Brown MODULE_AUTHOR("Kristen Carlson Accardi"); 437cda93e0SLen Brown MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); 44c8f7a62cSLen Brown MODULE_LICENSE("GPL"); 45c8f7a62cSLen Brown 46a0cd35fdSKristen Carlson Accardi static int immediate_undock = 1; 47a0cd35fdSKristen Carlson Accardi module_param(immediate_undock, bool, 0644); 48a0cd35fdSKristen Carlson Accardi MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " 49a0cd35fdSKristen Carlson Accardi "undock immediately when the undock button is pressed, 0 will cause" 50a0cd35fdSKristen Carlson Accardi " the driver to wait for userspace to write the undock sysfs file " 51a0cd35fdSKristen Carlson Accardi " before undocking"); 52a0cd35fdSKristen Carlson Accardi 53c8f7a62cSLen Brown static struct atomic_notifier_head dock_notifier_list; 54c8f7a62cSLen Brown 55a340af14SFrank Seidel static const struct acpi_device_id dock_device_ids[] = { 56a340af14SFrank Seidel {"LNXDOCK", 0}, 57a340af14SFrank Seidel {"", 0}, 58a340af14SFrank Seidel }; 59a340af14SFrank Seidel MODULE_DEVICE_TABLE(acpi, dock_device_ids); 60a340af14SFrank Seidel 61c8f7a62cSLen Brown struct dock_station { 62c8f7a62cSLen Brown acpi_handle handle; 63c8f7a62cSLen Brown unsigned long last_dock_time; 64c8f7a62cSLen Brown u32 flags; 65c8f7a62cSLen Brown spinlock_t dd_lock; 668b0dc866SKristen Carlson Accardi struct mutex hp_lock; 67c8f7a62cSLen Brown struct list_head dependent_devices; 68c8f7a62cSLen Brown struct list_head hotplug_devices; 69db350b08SShaohua Li 7050d716e4SAlex Chiang struct list_head sibling; 71db350b08SShaohua Li struct platform_device *dock_device; 72c8f7a62cSLen Brown }; 73db350b08SShaohua Li static LIST_HEAD(dock_stations); 74db350b08SShaohua Li static int dock_station_count; 75c8f7a62cSLen Brown 76c8f7a62cSLen Brown struct dock_dependent_device { 77c8f7a62cSLen Brown struct list_head list; 78c8f7a62cSLen Brown struct list_head hotplug_list; 79c8f7a62cSLen Brown acpi_handle handle; 801253f7aaSShaohua Li struct acpi_dock_ops *ops; 81c8f7a62cSLen Brown void *context; 82c8f7a62cSLen Brown }; 83c8f7a62cSLen Brown 84c8f7a62cSLen Brown #define DOCK_DOCKING 0x00000001 85a0cd35fdSKristen Carlson Accardi #define DOCK_UNDOCKING 0x00000002 86db350b08SShaohua Li #define DOCK_IS_DOCK 0x00000010 87db350b08SShaohua Li #define DOCK_IS_ATA 0x00000020 88db350b08SShaohua Li #define DOCK_IS_BAT 0x00000040 895669021eSKristen Carlson Accardi #define DOCK_EVENT 3 905669021eSKristen Carlson Accardi #define UNDOCK_EVENT 2 91c8f7a62cSLen Brown 92c8f7a62cSLen Brown /***************************************************************************** 93c8f7a62cSLen Brown * Dock Dependent device functions * 94c8f7a62cSLen Brown *****************************************************************************/ 95c8f7a62cSLen Brown /** 96f69cfdd2SAlex Chiang * add_dock_dependent_device - associate a device with the dock station 97f69cfdd2SAlex Chiang * @ds: The dock station 98f69cfdd2SAlex Chiang * @handle: handle of the dependent device 99c8f7a62cSLen Brown * 100f69cfdd2SAlex Chiang * Add the dependent device to the dock's dependent device list. 101c8f7a62cSLen Brown */ 102f69cfdd2SAlex Chiang static int 103f69cfdd2SAlex Chiang add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) 104c8f7a62cSLen Brown { 105c8f7a62cSLen Brown struct dock_dependent_device *dd; 106c8f7a62cSLen Brown 107c8f7a62cSLen Brown dd = kzalloc(sizeof(*dd), GFP_KERNEL); 108f69cfdd2SAlex Chiang if (!dd) 109f69cfdd2SAlex Chiang return -ENOMEM; 110f69cfdd2SAlex Chiang 111c8f7a62cSLen Brown dd->handle = handle; 112c8f7a62cSLen Brown INIT_LIST_HEAD(&dd->list); 113c8f7a62cSLen Brown INIT_LIST_HEAD(&dd->hotplug_list); 114c8f7a62cSLen Brown 115c8f7a62cSLen Brown spin_lock(&ds->dd_lock); 116c8f7a62cSLen Brown list_add_tail(&dd->list, &ds->dependent_devices); 117c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 118f69cfdd2SAlex Chiang 119f69cfdd2SAlex Chiang return 0; 120c8f7a62cSLen Brown } 121c8f7a62cSLen Brown 122c8f7a62cSLen Brown /** 123c8f7a62cSLen Brown * dock_add_hotplug_device - associate a hotplug handler with the dock station 124c8f7a62cSLen Brown * @ds: The dock station 125c8f7a62cSLen Brown * @dd: The dependent device struct 126c8f7a62cSLen Brown * 127c8f7a62cSLen Brown * Add the dependent device to the dock's hotplug device list 128c8f7a62cSLen Brown */ 129c8f7a62cSLen Brown static void 130c8f7a62cSLen Brown dock_add_hotplug_device(struct dock_station *ds, 131c8f7a62cSLen Brown struct dock_dependent_device *dd) 132c8f7a62cSLen Brown { 1338b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 134c8f7a62cSLen Brown list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); 1358b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 136c8f7a62cSLen Brown } 137c8f7a62cSLen Brown 138c8f7a62cSLen Brown /** 139c8f7a62cSLen Brown * dock_del_hotplug_device - remove a hotplug handler from the dock station 140c8f7a62cSLen Brown * @ds: The dock station 141c8f7a62cSLen Brown * @dd: the dependent device struct 142c8f7a62cSLen Brown * 143c8f7a62cSLen Brown * Delete the dependent device from the dock's hotplug device list 144c8f7a62cSLen Brown */ 145c8f7a62cSLen Brown static void 146c8f7a62cSLen Brown dock_del_hotplug_device(struct dock_station *ds, 147c8f7a62cSLen Brown struct dock_dependent_device *dd) 148c8f7a62cSLen Brown { 1498b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 150c8f7a62cSLen Brown list_del(&dd->hotplug_list); 1518b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 152c8f7a62cSLen Brown } 153c8f7a62cSLen Brown 154c8f7a62cSLen Brown /** 155c8f7a62cSLen Brown * find_dock_dependent_device - get a device dependent on this dock 156c8f7a62cSLen Brown * @ds: the dock station 157c8f7a62cSLen Brown * @handle: the acpi_handle of the device we want 158c8f7a62cSLen Brown * 159c8f7a62cSLen Brown * iterate over the dependent device list for this dock. If the 160c8f7a62cSLen Brown * dependent device matches the handle, return. 161c8f7a62cSLen Brown */ 162c8f7a62cSLen Brown static struct dock_dependent_device * 163c8f7a62cSLen Brown find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) 164c8f7a62cSLen Brown { 165c8f7a62cSLen Brown struct dock_dependent_device *dd; 166c8f7a62cSLen Brown 167c8f7a62cSLen Brown spin_lock(&ds->dd_lock); 168c8f7a62cSLen Brown list_for_each_entry(dd, &ds->dependent_devices, list) { 169c8f7a62cSLen Brown if (handle == dd->handle) { 170c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 171c8f7a62cSLen Brown return dd; 172c8f7a62cSLen Brown } 173c8f7a62cSLen Brown } 174c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 175c8f7a62cSLen Brown return NULL; 176c8f7a62cSLen Brown } 177c8f7a62cSLen Brown 178c8f7a62cSLen Brown /***************************************************************************** 179c8f7a62cSLen Brown * Dock functions * 180c8f7a62cSLen Brown *****************************************************************************/ 181c8f7a62cSLen Brown /** 182c8f7a62cSLen Brown * is_dock - see if a device is a dock station 183c8f7a62cSLen Brown * @handle: acpi handle of the device 184c8f7a62cSLen Brown * 185c8f7a62cSLen Brown * If an acpi object has a _DCK method, then it is by definition a dock 186c8f7a62cSLen Brown * station, so return true. 187c8f7a62cSLen Brown */ 188c8f7a62cSLen Brown static int is_dock(acpi_handle handle) 189c8f7a62cSLen Brown { 190c8f7a62cSLen Brown acpi_status status; 191c8f7a62cSLen Brown acpi_handle tmp; 192c8f7a62cSLen Brown 193c8f7a62cSLen Brown status = acpi_get_handle(handle, "_DCK", &tmp); 194c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 195c8f7a62cSLen Brown return 0; 196c8f7a62cSLen Brown return 1; 197c8f7a62cSLen Brown } 198c8f7a62cSLen Brown 199db350b08SShaohua Li static int is_ejectable(acpi_handle handle) 200db350b08SShaohua Li { 201db350b08SShaohua Li acpi_status status; 202db350b08SShaohua Li acpi_handle tmp; 203db350b08SShaohua Li 204db350b08SShaohua Li status = acpi_get_handle(handle, "_EJ0", &tmp); 205db350b08SShaohua Li if (ACPI_FAILURE(status)) 206db350b08SShaohua Li return 0; 207db350b08SShaohua Li return 1; 208db350b08SShaohua Li } 209db350b08SShaohua Li 210db350b08SShaohua Li static int is_ata(acpi_handle handle) 211db350b08SShaohua Li { 212db350b08SShaohua Li acpi_handle tmp; 213db350b08SShaohua Li 214db350b08SShaohua Li if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || 215db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || 216db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || 217db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) 218db350b08SShaohua Li return 1; 219db350b08SShaohua Li 220db350b08SShaohua Li return 0; 221db350b08SShaohua Li } 222db350b08SShaohua Li 223db350b08SShaohua Li static int is_battery(acpi_handle handle) 224db350b08SShaohua Li { 225db350b08SShaohua Li struct acpi_device_info *info; 226db350b08SShaohua Li int ret = 1; 227db350b08SShaohua Li 22815b8dd53SBob Moore if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) 229db350b08SShaohua Li return 0; 230db350b08SShaohua Li if (!(info->valid & ACPI_VALID_HID)) 231db350b08SShaohua Li ret = 0; 232db350b08SShaohua Li else 23315b8dd53SBob Moore ret = !strcmp("PNP0C0A", info->hardware_id.string); 234db350b08SShaohua Li 23515b8dd53SBob Moore kfree(info); 236db350b08SShaohua Li return ret; 237db350b08SShaohua Li } 238db350b08SShaohua Li 239db350b08SShaohua Li static int is_ejectable_bay(acpi_handle handle) 240db350b08SShaohua Li { 241db350b08SShaohua Li acpi_handle phandle; 242747479a3SAlex Chiang 243db350b08SShaohua Li if (!is_ejectable(handle)) 244db350b08SShaohua Li return 0; 245db350b08SShaohua Li if (is_battery(handle) || is_ata(handle)) 246db350b08SShaohua Li return 1; 247db350b08SShaohua Li if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) 248db350b08SShaohua Li return 1; 249db350b08SShaohua Li return 0; 250db350b08SShaohua Li } 251db350b08SShaohua Li 252c8f7a62cSLen Brown /** 253c8f7a62cSLen Brown * is_dock_device - see if a device is on a dock station 254c8f7a62cSLen Brown * @handle: acpi handle of the device 255c8f7a62cSLen Brown * 256c8f7a62cSLen Brown * If this device is either the dock station itself, 257c8f7a62cSLen Brown * or is a device dependent on the dock station, then it 258c8f7a62cSLen Brown * is a dock device 259c8f7a62cSLen Brown */ 260c8f7a62cSLen Brown int is_dock_device(acpi_handle handle) 261c8f7a62cSLen Brown { 262db350b08SShaohua Li struct dock_station *dock_station; 263db350b08SShaohua Li 264db350b08SShaohua Li if (!dock_station_count) 265c8f7a62cSLen Brown return 0; 266c8f7a62cSLen Brown 267db350b08SShaohua Li if (is_dock(handle)) 268c8f7a62cSLen Brown return 1; 269747479a3SAlex Chiang 270747479a3SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) 271db350b08SShaohua Li if (find_dock_dependent_device(dock_station, handle)) 272db350b08SShaohua Li return 1; 273c8f7a62cSLen Brown 274c8f7a62cSLen Brown return 0; 275c8f7a62cSLen Brown } 276c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(is_dock_device); 277c8f7a62cSLen Brown 278c8f7a62cSLen Brown /** 279c8f7a62cSLen Brown * dock_present - see if the dock station is present. 280c8f7a62cSLen Brown * @ds: the dock station 281c8f7a62cSLen Brown * 282c8f7a62cSLen Brown * execute the _STA method. note that present does not 283c8f7a62cSLen Brown * imply that we are docked. 284c8f7a62cSLen Brown */ 285c8f7a62cSLen Brown static int dock_present(struct dock_station *ds) 286c8f7a62cSLen Brown { 28727663c58SMatthew Wilcox unsigned long long sta; 288c8f7a62cSLen Brown acpi_status status; 289c8f7a62cSLen Brown 290c8f7a62cSLen Brown if (ds) { 291c8f7a62cSLen Brown status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); 292c8f7a62cSLen Brown if (ACPI_SUCCESS(status) && sta) 293c8f7a62cSLen Brown return 1; 294c8f7a62cSLen Brown } 295c8f7a62cSLen Brown return 0; 296c8f7a62cSLen Brown } 297c8f7a62cSLen Brown 298c8f7a62cSLen Brown /** 299c8f7a62cSLen Brown * dock_create_acpi_device - add new devices to acpi 300c8f7a62cSLen Brown * @handle - handle of the device to add 301c8f7a62cSLen Brown * 302c8f7a62cSLen Brown * This function will create a new acpi_device for the given 303c8f7a62cSLen Brown * handle if one does not exist already. This should cause 304c8f7a62cSLen Brown * acpi to scan for drivers for the given devices, and call 305c8f7a62cSLen Brown * matching driver's add routine. 306c8f7a62cSLen Brown * 307c8f7a62cSLen Brown * Returns a pointer to the acpi_device corresponding to the handle. 308c8f7a62cSLen Brown */ 309c8f7a62cSLen Brown static struct acpi_device * dock_create_acpi_device(acpi_handle handle) 310c8f7a62cSLen Brown { 311747479a3SAlex Chiang struct acpi_device *device; 312c8f7a62cSLen Brown struct acpi_device *parent_device; 313c8f7a62cSLen Brown acpi_handle parent; 314c8f7a62cSLen Brown int ret; 315c8f7a62cSLen Brown 316c8f7a62cSLen Brown if (acpi_bus_get_device(handle, &device)) { 317c8f7a62cSLen Brown /* 318c8f7a62cSLen Brown * no device created for this object, 319c8f7a62cSLen Brown * so we should create one. 320c8f7a62cSLen Brown */ 321c8f7a62cSLen Brown acpi_get_parent(handle, &parent); 322c8f7a62cSLen Brown if (acpi_bus_get_device(parent, &parent_device)) 323c8f7a62cSLen Brown parent_device = NULL; 324c8f7a62cSLen Brown 325c8f7a62cSLen Brown ret = acpi_bus_add(&device, parent_device, handle, 326c8f7a62cSLen Brown ACPI_BUS_TYPE_DEVICE); 327c8f7a62cSLen Brown if (ret) { 328747479a3SAlex Chiang pr_debug("error adding bus, %x\n", -ret); 329c8f7a62cSLen Brown return NULL; 330c8f7a62cSLen Brown } 331c8f7a62cSLen Brown } 332c8f7a62cSLen Brown return device; 333c8f7a62cSLen Brown } 334c8f7a62cSLen Brown 335c8f7a62cSLen Brown /** 336c8f7a62cSLen Brown * dock_remove_acpi_device - remove the acpi_device struct from acpi 337c8f7a62cSLen Brown * @handle - the handle of the device to remove 338c8f7a62cSLen Brown * 339c8f7a62cSLen Brown * Tell acpi to remove the acpi_device. This should cause any loaded 340c8f7a62cSLen Brown * driver to have it's remove routine called. 341c8f7a62cSLen Brown */ 342c8f7a62cSLen Brown static void dock_remove_acpi_device(acpi_handle handle) 343c8f7a62cSLen Brown { 344c8f7a62cSLen Brown struct acpi_device *device; 345c8f7a62cSLen Brown int ret; 346c8f7a62cSLen Brown 347c8f7a62cSLen Brown if (!acpi_bus_get_device(handle, &device)) { 348c8f7a62cSLen Brown ret = acpi_bus_trim(device, 1); 349c8f7a62cSLen Brown if (ret) 350c8f7a62cSLen Brown pr_debug("error removing bus, %x\n", -ret); 351c8f7a62cSLen Brown } 352c8f7a62cSLen Brown } 353c8f7a62cSLen Brown 354c8f7a62cSLen Brown /** 355c8f7a62cSLen Brown * hotplug_dock_devices - insert or remove devices on the dock station 356c8f7a62cSLen Brown * @ds: the dock station 357c8f7a62cSLen Brown * @event: either bus check or eject request 358c8f7a62cSLen Brown * 359c8f7a62cSLen Brown * Some devices on the dock station need to have drivers called 360c8f7a62cSLen Brown * to perform hotplug operations after a dock event has occurred. 361c8f7a62cSLen Brown * Traverse the list of dock devices that have registered a 362c8f7a62cSLen Brown * hotplug handler, and call the handler. 363c8f7a62cSLen Brown */ 364c8f7a62cSLen Brown static void hotplug_dock_devices(struct dock_station *ds, u32 event) 365c8f7a62cSLen Brown { 366c8f7a62cSLen Brown struct dock_dependent_device *dd; 367c8f7a62cSLen Brown 3688b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 369c8f7a62cSLen Brown 370c8f7a62cSLen Brown /* 371c8f7a62cSLen Brown * First call driver specific hotplug functions 372c8f7a62cSLen Brown */ 373747479a3SAlex Chiang list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) 3741253f7aaSShaohua Li if (dd->ops && dd->ops->handler) 3751253f7aaSShaohua Li dd->ops->handler(dd->handle, event, dd->context); 376c8f7a62cSLen Brown 377c8f7a62cSLen Brown /* 378c8f7a62cSLen Brown * Now make sure that an acpi_device is created for each 379c8f7a62cSLen Brown * dependent device, or removed if this is an eject request. 380c8f7a62cSLen Brown * This will cause acpi_drivers to be stopped/started if they 381c8f7a62cSLen Brown * exist 382c8f7a62cSLen Brown */ 383c8f7a62cSLen Brown list_for_each_entry(dd, &ds->dependent_devices, list) { 384c8f7a62cSLen Brown if (event == ACPI_NOTIFY_EJECT_REQUEST) 385c8f7a62cSLen Brown dock_remove_acpi_device(dd->handle); 386c8f7a62cSLen Brown else 387c8f7a62cSLen Brown dock_create_acpi_device(dd->handle); 388c8f7a62cSLen Brown } 3898b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 390c8f7a62cSLen Brown } 391c8f7a62cSLen Brown 392c8f7a62cSLen Brown static void dock_event(struct dock_station *ds, u32 event, int num) 393c8f7a62cSLen Brown { 394db350b08SShaohua Li struct device *dev = &ds->dock_device->dev; 39566b56821SHolger Macht char event_string[13]; 39679a8f70bSKristen Carlson Accardi char *envp[] = { event_string, NULL }; 3971253f7aaSShaohua Li struct dock_dependent_device *dd; 39879a8f70bSKristen Carlson Accardi 39979a8f70bSKristen Carlson Accardi if (num == UNDOCK_EVENT) 40066b56821SHolger Macht sprintf(event_string, "EVENT=undock"); 40179a8f70bSKristen Carlson Accardi else 40266b56821SHolger Macht sprintf(event_string, "EVENT=dock"); 40379a8f70bSKristen Carlson Accardi 4045669021eSKristen Carlson Accardi /* 4058ea86e0bSKristen Carlson Accardi * Indicate that the status of the dock station has 4068ea86e0bSKristen Carlson Accardi * changed. 4075669021eSKristen Carlson Accardi */ 4081253f7aaSShaohua Li if (num == DOCK_EVENT) 4091253f7aaSShaohua Li kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 4101253f7aaSShaohua Li 4111253f7aaSShaohua Li list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) 4121253f7aaSShaohua Li if (dd->ops && dd->ops->uevent) 4131253f7aaSShaohua Li dd->ops->uevent(dd->handle, event, dd->context); 414747479a3SAlex Chiang 4151253f7aaSShaohua Li if (num != DOCK_EVENT) 41679a8f70bSKristen Carlson Accardi kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 417c8f7a62cSLen Brown } 418c8f7a62cSLen Brown 419c8f7a62cSLen Brown /** 420c8f7a62cSLen Brown * eject_dock - respond to a dock eject request 421c8f7a62cSLen Brown * @ds: the dock station 422c8f7a62cSLen Brown * 423c8f7a62cSLen Brown * This is called after _DCK is called, to execute the dock station's 424c8f7a62cSLen Brown * _EJ0 method. 425c8f7a62cSLen Brown */ 426c8f7a62cSLen Brown static void eject_dock(struct dock_station *ds) 427c8f7a62cSLen Brown { 428c8f7a62cSLen Brown struct acpi_object_list arg_list; 429c8f7a62cSLen Brown union acpi_object arg; 430c8f7a62cSLen Brown acpi_status status; 431c8f7a62cSLen Brown acpi_handle tmp; 432c8f7a62cSLen Brown 433c8f7a62cSLen Brown /* all dock devices should have _EJ0, but check anyway */ 434c8f7a62cSLen Brown status = acpi_get_handle(ds->handle, "_EJ0", &tmp); 435c8f7a62cSLen Brown if (ACPI_FAILURE(status)) { 436c8f7a62cSLen Brown pr_debug("No _EJ0 support for dock device\n"); 437c8f7a62cSLen Brown return; 438c8f7a62cSLen Brown } 439c8f7a62cSLen Brown 440c8f7a62cSLen Brown arg_list.count = 1; 441c8f7a62cSLen Brown arg_list.pointer = &arg; 442c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 443c8f7a62cSLen Brown arg.integer.value = 1; 444c8f7a62cSLen Brown 445747479a3SAlex Chiang status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); 446747479a3SAlex Chiang if (ACPI_FAILURE(status)) 447c8f7a62cSLen Brown pr_debug("Failed to evaluate _EJ0!\n"); 448c8f7a62cSLen Brown } 449c8f7a62cSLen Brown 450c8f7a62cSLen Brown /** 451c8f7a62cSLen Brown * handle_dock - handle a dock event 452c8f7a62cSLen Brown * @ds: the dock station 453c8f7a62cSLen Brown * @dock: to dock, or undock - that is the question 454c8f7a62cSLen Brown * 455c8f7a62cSLen Brown * Execute the _DCK method in response to an acpi event 456c8f7a62cSLen Brown */ 457c8f7a62cSLen Brown static void handle_dock(struct dock_station *ds, int dock) 458c8f7a62cSLen Brown { 459c8f7a62cSLen Brown acpi_status status; 460c8f7a62cSLen Brown struct acpi_object_list arg_list; 461c8f7a62cSLen Brown union acpi_object arg; 462c8f7a62cSLen Brown struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 463c8f7a62cSLen Brown struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 464c8f7a62cSLen Brown 465c8f7a62cSLen Brown acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); 466c8f7a62cSLen Brown 4679254bc84SDmitry Torokhov printk(KERN_INFO PREFIX "%s - %s\n", 4689254bc84SDmitry Torokhov (char *)name_buffer.pointer, dock ? "docking" : "undocking"); 469c8f7a62cSLen Brown 470c8f7a62cSLen Brown /* _DCK method has one argument */ 471c8f7a62cSLen Brown arg_list.count = 1; 472c8f7a62cSLen Brown arg_list.pointer = &arg; 473c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 474c8f7a62cSLen Brown arg.integer.value = dock; 475c8f7a62cSLen Brown status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); 476db350b08SShaohua Li if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) 4770a918a94SThomas Renninger ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" 4780a918a94SThomas Renninger " _DCK\n", (char *)name_buffer.pointer)); 4790a918a94SThomas Renninger 480c8f7a62cSLen Brown kfree(buffer.pointer); 481c8f7a62cSLen Brown kfree(name_buffer.pointer); 482c8f7a62cSLen Brown } 483c8f7a62cSLen Brown 484c8f7a62cSLen Brown static inline void dock(struct dock_station *ds) 485c8f7a62cSLen Brown { 486c8f7a62cSLen Brown handle_dock(ds, 1); 487c8f7a62cSLen Brown } 488c8f7a62cSLen Brown 489c8f7a62cSLen Brown static inline void undock(struct dock_station *ds) 490c8f7a62cSLen Brown { 491c8f7a62cSLen Brown handle_dock(ds, 0); 492c8f7a62cSLen Brown } 493c8f7a62cSLen Brown 494c8f7a62cSLen Brown static inline void begin_dock(struct dock_station *ds) 495c8f7a62cSLen Brown { 496c8f7a62cSLen Brown ds->flags |= DOCK_DOCKING; 497c8f7a62cSLen Brown } 498c8f7a62cSLen Brown 499c8f7a62cSLen Brown static inline void complete_dock(struct dock_station *ds) 500c8f7a62cSLen Brown { 501c8f7a62cSLen Brown ds->flags &= ~(DOCK_DOCKING); 502c8f7a62cSLen Brown ds->last_dock_time = jiffies; 503c8f7a62cSLen Brown } 504c8f7a62cSLen Brown 505a0cd35fdSKristen Carlson Accardi static inline void begin_undock(struct dock_station *ds) 506a0cd35fdSKristen Carlson Accardi { 507a0cd35fdSKristen Carlson Accardi ds->flags |= DOCK_UNDOCKING; 508a0cd35fdSKristen Carlson Accardi } 509a0cd35fdSKristen Carlson Accardi 510a0cd35fdSKristen Carlson Accardi static inline void complete_undock(struct dock_station *ds) 511a0cd35fdSKristen Carlson Accardi { 512a0cd35fdSKristen Carlson Accardi ds->flags &= ~(DOCK_UNDOCKING); 513a0cd35fdSKristen Carlson Accardi } 514a0cd35fdSKristen Carlson Accardi 515406f692dSShaohua Li static void dock_lock(struct dock_station *ds, int lock) 516406f692dSShaohua Li { 517406f692dSShaohua Li struct acpi_object_list arg_list; 518406f692dSShaohua Li union acpi_object arg; 519406f692dSShaohua Li acpi_status status; 520406f692dSShaohua Li 521406f692dSShaohua Li arg_list.count = 1; 522406f692dSShaohua Li arg_list.pointer = &arg; 523406f692dSShaohua Li arg.type = ACPI_TYPE_INTEGER; 524406f692dSShaohua Li arg.integer.value = !!lock; 525406f692dSShaohua Li status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); 526406f692dSShaohua Li if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 527406f692dSShaohua Li if (lock) 528406f692dSShaohua Li printk(KERN_WARNING PREFIX "Locking device failed\n"); 529406f692dSShaohua Li else 530406f692dSShaohua Li printk(KERN_WARNING PREFIX "Unlocking device failed\n"); 531406f692dSShaohua Li } 532406f692dSShaohua Li } 533406f692dSShaohua Li 534c8f7a62cSLen Brown /** 535c8f7a62cSLen Brown * dock_in_progress - see if we are in the middle of handling a dock event 536c8f7a62cSLen Brown * @ds: the dock station 537c8f7a62cSLen Brown * 538c8f7a62cSLen Brown * Sometimes while docking, false dock events can be sent to the driver 539c8f7a62cSLen Brown * because good connections aren't made or some other reason. Ignore these 540c8f7a62cSLen Brown * if we are in the middle of doing something. 541c8f7a62cSLen Brown */ 542c8f7a62cSLen Brown static int dock_in_progress(struct dock_station *ds) 543c8f7a62cSLen Brown { 544c8f7a62cSLen Brown if ((ds->flags & DOCK_DOCKING) || 545c8f7a62cSLen Brown time_before(jiffies, (ds->last_dock_time + HZ))) 546c8f7a62cSLen Brown return 1; 547c8f7a62cSLen Brown return 0; 548c8f7a62cSLen Brown } 549c8f7a62cSLen Brown 550c8f7a62cSLen Brown /** 551c8f7a62cSLen Brown * register_dock_notifier - add yourself to the dock notifier list 552c8f7a62cSLen Brown * @nb: the callers notifier block 553c8f7a62cSLen Brown * 554c8f7a62cSLen Brown * If a driver wishes to be notified about dock events, they can 555c8f7a62cSLen Brown * use this function to put a notifier block on the dock notifier list. 556c8f7a62cSLen Brown * this notifier call chain will be called after a dock event, but 557c8f7a62cSLen Brown * before hotplugging any new devices. 558c8f7a62cSLen Brown */ 559c8f7a62cSLen Brown int register_dock_notifier(struct notifier_block *nb) 560c8f7a62cSLen Brown { 561db350b08SShaohua Li if (!dock_station_count) 5622548c06bSPrarit Bhargava return -ENODEV; 5632548c06bSPrarit Bhargava 564c8f7a62cSLen Brown return atomic_notifier_chain_register(&dock_notifier_list, nb); 565c8f7a62cSLen Brown } 566c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_dock_notifier); 567c8f7a62cSLen Brown 568c8f7a62cSLen Brown /** 569c8f7a62cSLen Brown * unregister_dock_notifier - remove yourself from the dock notifier list 570c8f7a62cSLen Brown * @nb: the callers notifier block 571c8f7a62cSLen Brown */ 572c8f7a62cSLen Brown void unregister_dock_notifier(struct notifier_block *nb) 573c8f7a62cSLen Brown { 574db350b08SShaohua Li if (!dock_station_count) 5752548c06bSPrarit Bhargava return; 5762548c06bSPrarit Bhargava 577c8f7a62cSLen Brown atomic_notifier_chain_unregister(&dock_notifier_list, nb); 578c8f7a62cSLen Brown } 579c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_dock_notifier); 580c8f7a62cSLen Brown 581c8f7a62cSLen Brown /** 582c8f7a62cSLen Brown * register_hotplug_dock_device - register a hotplug function 583c8f7a62cSLen Brown * @handle: the handle of the device 5841253f7aaSShaohua Li * @ops: handlers to call after docking 585c8f7a62cSLen Brown * @context: device specific data 586c8f7a62cSLen Brown * 587c8f7a62cSLen Brown * If a driver would like to perform a hotplug operation after a dock 588c8f7a62cSLen Brown * event, they can register an acpi_notifiy_handler to be called by 589c8f7a62cSLen Brown * the dock driver after _DCK is executed. 590c8f7a62cSLen Brown */ 591c8f7a62cSLen Brown int 5921253f7aaSShaohua Li register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, 593c8f7a62cSLen Brown void *context) 594c8f7a62cSLen Brown { 595c8f7a62cSLen Brown struct dock_dependent_device *dd; 596db350b08SShaohua Li struct dock_station *dock_station; 59761b83695SShaohua Li int ret = -EINVAL; 598c8f7a62cSLen Brown 599db350b08SShaohua Li if (!dock_station_count) 600c8f7a62cSLen Brown return -ENODEV; 601c8f7a62cSLen Brown 602c8f7a62cSLen Brown /* 603c8f7a62cSLen Brown * make sure this handle is for a device dependent on the dock, 604c8f7a62cSLen Brown * this would include the dock station itself 605c8f7a62cSLen Brown */ 60650d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 60761b83695SShaohua Li /* 60861b83695SShaohua Li * An ATA bay can be in a dock and itself can be ejected 6093ad2f3fbSDaniel Mack * separately, so there are two 'dock stations' which need the 61061b83695SShaohua Li * ops 61161b83695SShaohua Li */ 612c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 613c8f7a62cSLen Brown if (dd) { 6141253f7aaSShaohua Li dd->ops = ops; 615c8f7a62cSLen Brown dd->context = context; 616c8f7a62cSLen Brown dock_add_hotplug_device(dock_station, dd); 61761b83695SShaohua Li ret = 0; 618c8f7a62cSLen Brown } 619db350b08SShaohua Li } 620c8f7a62cSLen Brown 62161b83695SShaohua Li return ret; 622c8f7a62cSLen Brown } 623c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_hotplug_dock_device); 624c8f7a62cSLen Brown 625c8f7a62cSLen Brown /** 626c8f7a62cSLen Brown * unregister_hotplug_dock_device - remove yourself from the hotplug list 627c8f7a62cSLen Brown * @handle: the acpi handle of the device 628c8f7a62cSLen Brown */ 629c8f7a62cSLen Brown void unregister_hotplug_dock_device(acpi_handle handle) 630c8f7a62cSLen Brown { 631c8f7a62cSLen Brown struct dock_dependent_device *dd; 632db350b08SShaohua Li struct dock_station *dock_station; 633c8f7a62cSLen Brown 634db350b08SShaohua Li if (!dock_station_count) 635c8f7a62cSLen Brown return; 636c8f7a62cSLen Brown 63750d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 638c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 639c8f7a62cSLen Brown if (dd) 640c8f7a62cSLen Brown dock_del_hotplug_device(dock_station, dd); 641c8f7a62cSLen Brown } 642db350b08SShaohua Li } 643c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); 644c8f7a62cSLen Brown 645c8f7a62cSLen Brown /** 646c80fdbe8Sbrandon@ifup.org * handle_eject_request - handle an undock request checking for error conditions 647c80fdbe8Sbrandon@ifup.org * 648c80fdbe8Sbrandon@ifup.org * Check to make sure the dock device is still present, then undock and 649c80fdbe8Sbrandon@ifup.org * hotremove all the devices that may need removing. 650c80fdbe8Sbrandon@ifup.org */ 651c80fdbe8Sbrandon@ifup.org static int handle_eject_request(struct dock_station *ds, u32 event) 652c80fdbe8Sbrandon@ifup.org { 653c80fdbe8Sbrandon@ifup.org if (dock_in_progress(ds)) 654c80fdbe8Sbrandon@ifup.org return -EBUSY; 655c80fdbe8Sbrandon@ifup.org 656c80fdbe8Sbrandon@ifup.org /* 657c80fdbe8Sbrandon@ifup.org * here we need to generate the undock 658c80fdbe8Sbrandon@ifup.org * event prior to actually doing the undock 659c80fdbe8Sbrandon@ifup.org * so that the device struct still exists. 660afd7301dSHolger Macht * Also, even send the dock event if the 661afd7301dSHolger Macht * device is not present anymore 662c80fdbe8Sbrandon@ifup.org */ 663c80fdbe8Sbrandon@ifup.org dock_event(ds, event, UNDOCK_EVENT); 664afd7301dSHolger Macht 665c80fdbe8Sbrandon@ifup.org hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); 666c80fdbe8Sbrandon@ifup.org undock(ds); 667406f692dSShaohua Li dock_lock(ds, 0); 668c80fdbe8Sbrandon@ifup.org eject_dock(ds); 669c80fdbe8Sbrandon@ifup.org if (dock_present(ds)) { 670c80fdbe8Sbrandon@ifup.org printk(KERN_ERR PREFIX "Unable to undock!\n"); 671c80fdbe8Sbrandon@ifup.org return -EBUSY; 672c80fdbe8Sbrandon@ifup.org } 673a0cd35fdSKristen Carlson Accardi complete_undock(ds); 674c80fdbe8Sbrandon@ifup.org return 0; 675c80fdbe8Sbrandon@ifup.org } 676c80fdbe8Sbrandon@ifup.org 677c80fdbe8Sbrandon@ifup.org /** 678c8f7a62cSLen Brown * dock_notify - act upon an acpi dock notification 679c8f7a62cSLen Brown * @handle: the dock station handle 680c8f7a62cSLen Brown * @event: the acpi event 681c8f7a62cSLen Brown * @data: our driver data struct 682c8f7a62cSLen Brown * 683c8f7a62cSLen Brown * If we are notified to dock, then check to see if the dock is 684c8f7a62cSLen Brown * present and then dock. Notify all drivers of the dock event, 685c80fdbe8Sbrandon@ifup.org * and then hotplug and devices that may need hotplugging. 686c8f7a62cSLen Brown */ 687c8f7a62cSLen Brown static void dock_notify(acpi_handle handle, u32 event, void *data) 688c8f7a62cSLen Brown { 68950dd0969SJan Engelhardt struct dock_station *ds = data; 6908b59560aSShaohua Li struct acpi_device *tmp; 691db350b08SShaohua Li int surprise_removal = 0; 692c8f7a62cSLen Brown 693db350b08SShaohua Li /* 694db350b08SShaohua Li * According to acpi spec 3.0a, if a DEVICE_CHECK notification 695db350b08SShaohua Li * is sent and _DCK is present, it is assumed to mean an undock 696db350b08SShaohua Li * request. 697db350b08SShaohua Li */ 698db350b08SShaohua Li if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) 699db350b08SShaohua Li event = ACPI_NOTIFY_EJECT_REQUEST; 700db350b08SShaohua Li 701db350b08SShaohua Li /* 702db350b08SShaohua Li * dock station: BUS_CHECK - docked or surprise removal 703db350b08SShaohua Li * DEVICE_CHECK - undocked 704db350b08SShaohua Li * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal 705db350b08SShaohua Li * 706db350b08SShaohua Li * To simplify event handling, dock dependent device handler always 707db350b08SShaohua Li * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and 708db350b08SShaohua Li * ACPI_NOTIFY_EJECT_REQUEST for removal 709db350b08SShaohua Li */ 710c8f7a62cSLen Brown switch (event) { 711c8f7a62cSLen Brown case ACPI_NOTIFY_BUS_CHECK: 712db350b08SShaohua Li case ACPI_NOTIFY_DEVICE_CHECK: 7138b59560aSShaohua Li if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, 7148b59560aSShaohua Li &tmp)) { 715c8f7a62cSLen Brown begin_dock(ds); 716c8f7a62cSLen Brown dock(ds); 717c8f7a62cSLen Brown if (!dock_present(ds)) { 718c8f7a62cSLen Brown printk(KERN_ERR PREFIX "Unable to dock!\n"); 7198b59560aSShaohua Li complete_dock(ds); 720c8f7a62cSLen Brown break; 721c8f7a62cSLen Brown } 722c8f7a62cSLen Brown atomic_notifier_call_chain(&dock_notifier_list, 723c8f7a62cSLen Brown event, NULL); 724c8f7a62cSLen Brown hotplug_dock_devices(ds, event); 725c8f7a62cSLen Brown complete_dock(ds); 726c8f7a62cSLen Brown dock_event(ds, event, DOCK_EVENT); 727406f692dSShaohua Li dock_lock(ds, 1); 728c8f7a62cSLen Brown break; 729db350b08SShaohua Li } 730db350b08SShaohua Li if (dock_present(ds) || dock_in_progress(ds)) 731db350b08SShaohua Li break; 732db350b08SShaohua Li /* This is a surprise removal */ 733db350b08SShaohua Li surprise_removal = 1; 734db350b08SShaohua Li event = ACPI_NOTIFY_EJECT_REQUEST; 735db350b08SShaohua Li /* Fall back */ 736c8f7a62cSLen Brown case ACPI_NOTIFY_EJECT_REQUEST: 737a0cd35fdSKristen Carlson Accardi begin_undock(ds); 738f730ae18SShaohua Li if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) 739f730ae18SShaohua Li || surprise_removal) 740c80fdbe8Sbrandon@ifup.org handle_eject_request(ds, event); 741a0cd35fdSKristen Carlson Accardi else 742a0cd35fdSKristen Carlson Accardi dock_event(ds, event, UNDOCK_EVENT); 743c8f7a62cSLen Brown break; 744c8f7a62cSLen Brown default: 745c8f7a62cSLen Brown printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); 746c8f7a62cSLen Brown } 747c8f7a62cSLen Brown } 748c8f7a62cSLen Brown 74919cd847aSZhang Rui struct dock_data { 75019cd847aSZhang Rui acpi_handle handle; 75119cd847aSZhang Rui unsigned long event; 75219cd847aSZhang Rui struct dock_station *ds; 75319cd847aSZhang Rui }; 75419cd847aSZhang Rui 75519cd847aSZhang Rui static void acpi_dock_deferred_cb(void *context) 75619cd847aSZhang Rui { 757747479a3SAlex Chiang struct dock_data *data = context; 75819cd847aSZhang Rui 75919cd847aSZhang Rui dock_notify(data->handle, data->event, data->ds); 76019cd847aSZhang Rui kfree(data); 76119cd847aSZhang Rui } 76219cd847aSZhang Rui 7636bd00a61SShaohua Li static int acpi_dock_notifier_call(struct notifier_block *this, 7646bd00a61SShaohua Li unsigned long event, void *data) 7656bd00a61SShaohua Li { 7666bd00a61SShaohua Li struct dock_station *dock_station; 767747479a3SAlex Chiang acpi_handle handle = data; 7686bd00a61SShaohua Li 7696bd00a61SShaohua Li if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK 7706bd00a61SShaohua Li && event != ACPI_NOTIFY_EJECT_REQUEST) 7716bd00a61SShaohua Li return 0; 77250d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 7736bd00a61SShaohua Li if (dock_station->handle == handle) { 774747479a3SAlex Chiang struct dock_data *dd; 77519cd847aSZhang Rui 776747479a3SAlex Chiang dd = kmalloc(sizeof(*dd), GFP_KERNEL); 777747479a3SAlex Chiang if (!dd) 77819cd847aSZhang Rui return 0; 779747479a3SAlex Chiang dd->handle = handle; 780747479a3SAlex Chiang dd->event = event; 781747479a3SAlex Chiang dd->ds = dock_station; 782747479a3SAlex Chiang acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd); 7836bd00a61SShaohua Li return 0 ; 7846bd00a61SShaohua Li } 7856bd00a61SShaohua Li } 7866bd00a61SShaohua Li return 0; 7876bd00a61SShaohua Li } 7886bd00a61SShaohua Li 7896bd00a61SShaohua Li static struct notifier_block dock_acpi_notifier = { 7906bd00a61SShaohua Li .notifier_call = acpi_dock_notifier_call, 7916bd00a61SShaohua Li }; 7926bd00a61SShaohua Li 793c8f7a62cSLen Brown /** 794c8f7a62cSLen Brown * find_dock_devices - find devices on the dock station 795c8f7a62cSLen Brown * @handle: the handle of the device we are examining 796c8f7a62cSLen Brown * @lvl: unused 797c8f7a62cSLen Brown * @context: the dock station private data 798c8f7a62cSLen Brown * @rv: unused 799c8f7a62cSLen Brown * 800c8f7a62cSLen Brown * This function is called by acpi_walk_namespace. It will 801c8f7a62cSLen Brown * check to see if an object has an _EJD method. If it does, then it 802c8f7a62cSLen Brown * will see if it is dependent on the dock station. 803c8f7a62cSLen Brown */ 804c8f7a62cSLen Brown static acpi_status 805c8f7a62cSLen Brown find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) 806c8f7a62cSLen Brown { 807c8f7a62cSLen Brown acpi_status status; 808fe9a2f77SKristen Carlson Accardi acpi_handle tmp, parent; 80950dd0969SJan Engelhardt struct dock_station *ds = context; 810c8f7a62cSLen Brown 811c8f7a62cSLen Brown status = acpi_bus_get_ejd(handle, &tmp); 812fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) { 813fe9a2f77SKristen Carlson Accardi /* try the parent device as well */ 814fe9a2f77SKristen Carlson Accardi status = acpi_get_parent(handle, &parent); 815c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 816fe9a2f77SKristen Carlson Accardi goto fdd_out; 817fe9a2f77SKristen Carlson Accardi /* see if parent is dependent on dock */ 818fe9a2f77SKristen Carlson Accardi status = acpi_bus_get_ejd(parent, &tmp); 819fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) 820fe9a2f77SKristen Carlson Accardi goto fdd_out; 821fe9a2f77SKristen Carlson Accardi } 822c8f7a62cSLen Brown 823f69cfdd2SAlex Chiang if (tmp == ds->handle) 824f69cfdd2SAlex Chiang add_dock_dependent_device(ds, handle); 825f69cfdd2SAlex Chiang 826fe9a2f77SKristen Carlson Accardi fdd_out: 827c8f7a62cSLen Brown return AE_OK; 828c8f7a62cSLen Brown } 829c8f7a62cSLen Brown 830c80fdbe8Sbrandon@ifup.org /* 831c80fdbe8Sbrandon@ifup.org * show_docked - read method for "docked" file in sysfs 832c80fdbe8Sbrandon@ifup.org */ 833c80fdbe8Sbrandon@ifup.org static ssize_t show_docked(struct device *dev, 834c80fdbe8Sbrandon@ifup.org struct device_attribute *attr, char *buf) 835c80fdbe8Sbrandon@ifup.org { 836fc5a9f88SHolger Macht struct acpi_device *tmp; 837fc5a9f88SHolger Macht 838fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 839c80fdbe8Sbrandon@ifup.org 840fc5a9f88SHolger Macht if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) 841fc5a9f88SHolger Macht return snprintf(buf, PAGE_SIZE, "1\n"); 842fc5a9f88SHolger Macht return snprintf(buf, PAGE_SIZE, "0\n"); 843c80fdbe8Sbrandon@ifup.org } 844e5685b9dSAdrian Bunk static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); 845c80fdbe8Sbrandon@ifup.org 846c80fdbe8Sbrandon@ifup.org /* 847a0cd35fdSKristen Carlson Accardi * show_flags - read method for flags file in sysfs 848a0cd35fdSKristen Carlson Accardi */ 849a0cd35fdSKristen Carlson Accardi static ssize_t show_flags(struct device *dev, 850a0cd35fdSKristen Carlson Accardi struct device_attribute *attr, char *buf) 851a0cd35fdSKristen Carlson Accardi { 852fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 853a0cd35fdSKristen Carlson Accardi return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); 854a0cd35fdSKristen Carlson Accardi 855a0cd35fdSKristen Carlson Accardi } 856e5685b9dSAdrian Bunk static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); 857a0cd35fdSKristen Carlson Accardi 858a0cd35fdSKristen Carlson Accardi /* 859c80fdbe8Sbrandon@ifup.org * write_undock - write method for "undock" file in sysfs 860c80fdbe8Sbrandon@ifup.org */ 861c80fdbe8Sbrandon@ifup.org static ssize_t write_undock(struct device *dev, struct device_attribute *attr, 862c80fdbe8Sbrandon@ifup.org const char *buf, size_t count) 863c80fdbe8Sbrandon@ifup.org { 864c80fdbe8Sbrandon@ifup.org int ret; 865fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 866c80fdbe8Sbrandon@ifup.org 867c80fdbe8Sbrandon@ifup.org if (!count) 868c80fdbe8Sbrandon@ifup.org return -EINVAL; 869c80fdbe8Sbrandon@ifup.org 8709171f834SHolger Macht begin_undock(dock_station); 871c80fdbe8Sbrandon@ifup.org ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); 872c80fdbe8Sbrandon@ifup.org return ret ? ret: count; 873c80fdbe8Sbrandon@ifup.org } 874e5685b9dSAdrian Bunk static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); 875c80fdbe8Sbrandon@ifup.org 876ac122bb6SIlya A. Volynets-Evenbakh /* 877ac122bb6SIlya A. Volynets-Evenbakh * show_dock_uid - read method for "uid" file in sysfs 878ac122bb6SIlya A. Volynets-Evenbakh */ 879ac122bb6SIlya A. Volynets-Evenbakh static ssize_t show_dock_uid(struct device *dev, 880ac122bb6SIlya A. Volynets-Evenbakh struct device_attribute *attr, char *buf) 881ac122bb6SIlya A. Volynets-Evenbakh { 88227663c58SMatthew Wilcox unsigned long long lbuf; 883fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 88438ff4ffcSKristen Carlson Accardi acpi_status status = acpi_evaluate_integer(dock_station->handle, 88538ff4ffcSKristen Carlson Accardi "_UID", NULL, &lbuf); 88638ff4ffcSKristen Carlson Accardi if (ACPI_FAILURE(status)) 887ac122bb6SIlya A. Volynets-Evenbakh return 0; 88838ff4ffcSKristen Carlson Accardi 88927663c58SMatthew Wilcox return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); 890ac122bb6SIlya A. Volynets-Evenbakh } 891e5685b9dSAdrian Bunk static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); 892ac122bb6SIlya A. Volynets-Evenbakh 8938652b00fSShaohua Li static ssize_t show_dock_type(struct device *dev, 8948652b00fSShaohua Li struct device_attribute *attr, char *buf) 8958652b00fSShaohua Li { 896fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 8978652b00fSShaohua Li char *type; 8988652b00fSShaohua Li 8998652b00fSShaohua Li if (dock_station->flags & DOCK_IS_DOCK) 9008652b00fSShaohua Li type = "dock_station"; 9018652b00fSShaohua Li else if (dock_station->flags & DOCK_IS_ATA) 9028652b00fSShaohua Li type = "ata_bay"; 9038652b00fSShaohua Li else if (dock_station->flags & DOCK_IS_BAT) 9048652b00fSShaohua Li type = "battery_bay"; 9058652b00fSShaohua Li else 9068652b00fSShaohua Li type = "unknown"; 9078652b00fSShaohua Li 9088652b00fSShaohua Li return snprintf(buf, PAGE_SIZE, "%s\n", type); 9098652b00fSShaohua Li } 9108652b00fSShaohua Li static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); 9118652b00fSShaohua Li 9125f46c2f2SAlex Chiang static struct attribute *dock_attributes[] = { 9135f46c2f2SAlex Chiang &dev_attr_docked.attr, 9145f46c2f2SAlex Chiang &dev_attr_flags.attr, 9155f46c2f2SAlex Chiang &dev_attr_undock.attr, 9165f46c2f2SAlex Chiang &dev_attr_uid.attr, 9175f46c2f2SAlex Chiang &dev_attr_type.attr, 9185f46c2f2SAlex Chiang NULL 9195f46c2f2SAlex Chiang }; 9205f46c2f2SAlex Chiang 9215f46c2f2SAlex Chiang static struct attribute_group dock_attribute_group = { 9225f46c2f2SAlex Chiang .attrs = dock_attributes 9235f46c2f2SAlex Chiang }; 9245f46c2f2SAlex Chiang 925c8f7a62cSLen Brown /** 926c8f7a62cSLen Brown * dock_add - add a new dock station 927c8f7a62cSLen Brown * @handle: the dock station handle 928c8f7a62cSLen Brown * 929c8f7a62cSLen Brown * allocated and initialize a new dock station device. Find all devices 930c8f7a62cSLen Brown * that are on the dock station, and register for dock event notifications. 931c8f7a62cSLen Brown */ 932d38a5edfSUwe Kleine-König static int __init dock_add(acpi_handle handle) 933c8f7a62cSLen Brown { 934fe06fba2SAlex Chiang int ret, id; 935fe06fba2SAlex Chiang struct dock_station ds, *dock_station; 936747479a3SAlex Chiang struct platform_device *dd; 937c8f7a62cSLen Brown 938fe06fba2SAlex Chiang id = dock_station_count; 93949c6fb2eSAlex Chiang memset(&ds, 0, sizeof(ds)); 940747479a3SAlex Chiang dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); 941747479a3SAlex Chiang if (IS_ERR(dd)) 942747479a3SAlex Chiang return PTR_ERR(dd); 9439751cb72SAlex Chiang 944747479a3SAlex Chiang dock_station = dd->dev.platform_data; 945747479a3SAlex Chiang 946c8f7a62cSLen Brown dock_station->handle = handle; 947747479a3SAlex Chiang dock_station->dock_device = dd; 948c8f7a62cSLen Brown dock_station->last_dock_time = jiffies - HZ; 949c8f7a62cSLen Brown 950c8f7a62cSLen Brown mutex_init(&dock_station->hp_lock); 951747479a3SAlex Chiang spin_lock_init(&dock_station->dd_lock); 952747479a3SAlex Chiang INIT_LIST_HEAD(&dock_station->sibling); 953747479a3SAlex Chiang INIT_LIST_HEAD(&dock_station->hotplug_devices); 954c8f7a62cSLen Brown ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); 955747479a3SAlex Chiang INIT_LIST_HEAD(&dock_station->dependent_devices); 956a0cd35fdSKristen Carlson Accardi 9579ef2a9a9SKristen Carlson Accardi /* we want the dock device to send uevents */ 958747479a3SAlex Chiang dev_set_uevent_suppress(&dd->dev, 0); 9599ef2a9a9SKristen Carlson Accardi 960db350b08SShaohua Li if (is_dock(handle)) 961db350b08SShaohua Li dock_station->flags |= DOCK_IS_DOCK; 962db350b08SShaohua Li if (is_ata(handle)) 963db350b08SShaohua Li dock_station->flags |= DOCK_IS_ATA; 964db350b08SShaohua Li if (is_battery(handle)) 965db350b08SShaohua Li dock_station->flags |= DOCK_IS_BAT; 966db350b08SShaohua Li 967747479a3SAlex Chiang ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); 9688652b00fSShaohua Li if (ret) 9695f46c2f2SAlex Chiang goto err_unregister; 970671adbecSKristen Carlson Accardi 971c8f7a62cSLen Brown /* Find dependent devices */ 972c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 9732263576cSLin Ming ACPI_UINT32_MAX, find_dock_devices, NULL, 9742263576cSLin Ming dock_station, NULL); 975c8f7a62cSLen Brown 976c8f7a62cSLen Brown /* add the dock station as a device dependent on itself */ 977f69cfdd2SAlex Chiang ret = add_dock_dependent_device(dock_station, handle); 978f69cfdd2SAlex Chiang if (ret) 9795f46c2f2SAlex Chiang goto err_rmgroup; 980c8f7a62cSLen Brown 981db350b08SShaohua Li dock_station_count++; 98250d716e4SAlex Chiang list_add(&dock_station->sibling, &dock_stations); 983c8f7a62cSLen Brown return 0; 984c8f7a62cSLen Brown 9855f46c2f2SAlex Chiang err_rmgroup: 986747479a3SAlex Chiang sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); 9875f46c2f2SAlex Chiang err_unregister: 988747479a3SAlex Chiang platform_device_unregister(dd); 9895f46c2f2SAlex Chiang printk(KERN_ERR "%s encountered error %d\n", __func__, ret); 990c8f7a62cSLen Brown return ret; 991c8f7a62cSLen Brown } 992c8f7a62cSLen Brown 993c8f7a62cSLen Brown /** 994c8f7a62cSLen Brown * dock_remove - free up resources related to the dock station 995c8f7a62cSLen Brown */ 996747479a3SAlex Chiang static int dock_remove(struct dock_station *ds) 997c8f7a62cSLen Brown { 998c8f7a62cSLen Brown struct dock_dependent_device *dd, *tmp; 999747479a3SAlex Chiang struct platform_device *dock_device = ds->dock_device; 1000c8f7a62cSLen Brown 1001db350b08SShaohua Li if (!dock_station_count) 1002c8f7a62cSLen Brown return 0; 1003c8f7a62cSLen Brown 1004c8f7a62cSLen Brown /* remove dependent devices */ 1005747479a3SAlex Chiang list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list) 1006c8f7a62cSLen Brown kfree(dd); 1007c8f7a62cSLen Brown 1008747479a3SAlex Chiang list_del(&ds->sibling); 1009fe06fba2SAlex Chiang 1010671adbecSKristen Carlson Accardi /* cleanup sysfs */ 10115f46c2f2SAlex Chiang sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group); 10120f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 1013671adbecSKristen Carlson Accardi 1014c8f7a62cSLen Brown return 0; 1015c8f7a62cSLen Brown } 1016c8f7a62cSLen Brown 1017c8f7a62cSLen Brown /** 1018c8f7a62cSLen Brown * find_dock - look for a dock station 1019c8f7a62cSLen Brown * @handle: acpi handle of a device 1020c8f7a62cSLen Brown * @lvl: unused 1021c8f7a62cSLen Brown * @context: counter of dock stations found 1022c8f7a62cSLen Brown * @rv: unused 1023c8f7a62cSLen Brown * 1024c8f7a62cSLen Brown * This is called by acpi_walk_namespace to look for dock stations. 1025c8f7a62cSLen Brown */ 1026d38a5edfSUwe Kleine-König static __init acpi_status 1027c8f7a62cSLen Brown find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) 1028c8f7a62cSLen Brown { 1029747479a3SAlex Chiang if (is_dock(handle)) 10301ee4d61fSZhang Rui dock_add(handle); 1031747479a3SAlex Chiang 10321ee4d61fSZhang Rui return AE_OK; 1033c8f7a62cSLen Brown } 1034c8f7a62cSLen Brown 1035d38a5edfSUwe Kleine-König static __init acpi_status 1036db350b08SShaohua Li find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) 1037db350b08SShaohua Li { 103861b83695SShaohua Li /* If bay is a dock, it's already handled */ 103961b83695SShaohua Li if (is_ejectable_bay(handle) && !is_dock(handle)) 1040db350b08SShaohua Li dock_add(handle); 1041db350b08SShaohua Li return AE_OK; 1042db350b08SShaohua Li } 1043db350b08SShaohua Li 1044c8f7a62cSLen Brown static int __init dock_init(void) 1045c8f7a62cSLen Brown { 1046816c2edaSLen Brown if (acpi_disabled) 1047816c2edaSLen Brown return 0; 1048816c2edaSLen Brown 1049c8f7a62cSLen Brown /* look for a dock station */ 1050c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 10512263576cSLin Ming ACPI_UINT32_MAX, find_dock, NULL, NULL, NULL); 1052c8f7a62cSLen Brown 1053db350b08SShaohua Li /* look for bay */ 1054db350b08SShaohua Li acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 10552263576cSLin Ming ACPI_UINT32_MAX, find_bay, NULL, NULL, NULL); 1056db350b08SShaohua Li if (!dock_station_count) { 1057db350b08SShaohua Li printk(KERN_INFO PREFIX "No dock devices found.\n"); 1058db350b08SShaohua Li return 0; 1059db350b08SShaohua Li } 1060c8f7a62cSLen Brown 10616bd00a61SShaohua Li register_acpi_bus_notifier(&dock_acpi_notifier); 1062db350b08SShaohua Li printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", 1063db350b08SShaohua Li ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); 1064c8f7a62cSLen Brown return 0; 1065c8f7a62cSLen Brown } 1066c8f7a62cSLen Brown 1067c8f7a62cSLen Brown static void __exit dock_exit(void) 1068c8f7a62cSLen Brown { 1069747479a3SAlex Chiang struct dock_station *tmp, *dock_station; 1070db350b08SShaohua Li 10716bd00a61SShaohua Li unregister_acpi_bus_notifier(&dock_acpi_notifier); 107250d716e4SAlex Chiang list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling) 1073db350b08SShaohua Li dock_remove(dock_station); 1074c8f7a62cSLen Brown } 1075c8f7a62cSLen Brown 1076db350b08SShaohua Li /* 1077db350b08SShaohua Li * Must be called before drivers of devices in dock, otherwise we can't know 1078db350b08SShaohua Li * which devices are in a dock 1079db350b08SShaohua Li */ 1080db350b08SShaohua Li subsys_initcall(dock_init); 1081c8f7a62cSLen Brown module_exit(dock_exit); 1082